Guide/Liquid Airlock

A Liquid Airlock or Liquid lock is an alternative to a regular airlock. It is a player-made design, exploiting game's handling of liquids and gasses.

Advantages
The Liquid Airlock fully stops gas flow between two rooms. Unlike the regular airlock it makes the room 100% airtight. It requires neither power nor complex automation circuits. And even able to easily contain vacuum.

Disadvantages
Walking through liquid, even pure water gives duplicants the Sopping Wet debuff. Dupes that repeatedly use the airlock also are at risk of contracting Hypothermia or Heat Stroke due to change in body temperature.

Equipping duplicants with Atmo Suits prevents both issues.

Construction
Any liquid can be used to build an airlock, but most often it is built out of water, oil, or, at later stages, Visco-Gel.

Classic Water Lock
The pictures below illustrate the bare minimum requirement for an airtight water lock. There are multiple ways to get water to the tiles but the Bottle Emptier is the easiest and most reliable. Make sure "Water" and "Enable Autobottling" are selected/turned on under the Bottle Emptier's options.

Requirements:


 * 6 Tile
 * 1 or 2 Bottle Emptiers
 * At least 1,001 kg of Water

Superior Water Lock
This airlock reduces the time to pass through it, but is harder to build
 * 1) Prepare a 3x4 Space like this ( X are any gas, and O is any Tiles) (The 2 X on bottom is important to let the liquid leave and form the lock)
 * 2) Pipe in 2 different type of liquid (preferably water and polluted water)
 * 3) Pipe those two liquid each on top of each-other between the two tiles  (Numbers is where the liquid pipe should be at)   (use bridges to nowhere to make the liquid flow there):
 * 4) Deconstruct those pipe between the tiles without emptying it
 * 5) Voila
 * 1) Pipe in 2 different type of liquid (preferably water and polluted water)
 * 2) Pipe those two liquid each on top of each-other between the two tiles  (Numbers is where the liquid pipe should be at)   (use bridges to nowhere to make the liquid flow there):
 * 3) Deconstruct those pipe between the tiles without emptying it
 * 4) Voila
 * 1) Deconstruct those pipe between the tiles without emptying it
 * 2) Voila
 * 1) Deconstruct those pipe between the tiles without emptying it
 * 2) Voila

Superior Water Lock (alternative method)
There is a second way of building this water lock that only requires 1 Bottle Emptier and 1 Mesh Tile, rather than filled pipes. However, it does make a bigger mess than Method 1

Requirements:


 * An empty 3x4 space
 * 1 Mesh Tile
 * 1 Bottle Emptier
 * Bottles of desired liquid (water and polluted water will be used here)

Expect a lot of overflowing and mopping afterwards

Tips

 * It's even better if it's oil and petroleum so that the airlock can withstand extreme temperatures
 * There is also an advanced version where you create a vacuum via 3 mechanized airlock, and create two waterlock beside the central vacuum door. (This version creates virtually no heat.)